Speaking on Giant Bomb's live show tonight, Xbox boss Phil Spencer set expectations for the breadth of the library of OG Xbox games for Xbox One. He said the lineup will not be as large as the number of Xbox 360 games. Why? One part of it is the rights; it is more difficult to lock these down, Spencer said. And secondly, it is more technically difficult, Spencer explained.

There are only two OG Xbox games confirmed for the Xbox One's backwards compatibility library so far: Crimson Skies and Fuzion Frenzy. The program launches later this year. By comparison, there are more than 385 Xbox 360 games playable on Xbox One through backwards compatibility--you can see them all here.